day-by-day
UK[ˌdeɪ baɪ ˈdeɪ]US[ˌdeɪ baɪ ˈdeɪ]
adj
Happening or done each day; daily.
adv
On a daily basis; each day.
Morpheme Breakdown
day
by
day
day
unit of time
by
indicating succession
day
unit of time
Etymology
The compound 'day-by-day' is a modern English formation built from the fundamental, ancient Germanic word 'day'. The preposition 'by', also of Old English origin, is used here in its sequential sense to indicate progression from one unit to the next. The reduplication of 'day' creates a rhythmic, iterative pattern that vividly conveys the concept of incremental, daily progression. This transparent compounding logic directly reflects its meaning, describing something that occurs or is assessed in successive daily stages, emphasizing a gradual, stepwise process.
Analysis
Structure: day (unit of time) + by (indicating succession) + day (unit of time)
- day: From Old English 'dæg', meaning the period of daylight or a full 24-hour cycle. Its ultimate origin is Proto-Germanic dagaz.
- by: From Old English 'bī', a preposition meaning 'near, in, during, through'. It is of Germanic origin, related to Dutch 'bij' and German 'bei'.
- day: (Repeated) Same as above.
Examples
The patient's day-by-day recovery was carefully documented by the nurses.
We made our plans day-by-day, adapting to the changing weather.
The report provides a day-by-day account of the expedition's progress.